/**
* Internal function to mask portions of the visitor IP address
*
* @param string $ip IP address in network address format
* @param int $maskLength Number of octets to reset
* @return string
*/
public static function applyIPMask($ip, $maskLength)
{
// IPv4 or mapped IPv4 in IPv6
if (IP::isIPv4($ip)) {
$i = strlen($ip);
if ($maskLength > $i) {
$maskLength = $i;
}
while ($maskLength-- > 0) {
$ip[--$i] = chr(0);
}
} else {
$masks = array('ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff', 'ffff:ffff:ffff:ffff::', 'ffff:ffff:ffff:0000::', 'ffff:ff00:0000:0000::');
$ip = $ip & pack('a16', inet_pton($masks[$maskLength]));
}
return $ip;
}
